Brake band



Jan. 8, 1929.

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:ATTORNEY g d/ 'aYww Patented Jan. 8, 1929 HARRY B HILLS, OF LOS'ANGELES, CALIFORNIA;

BRAKE BAND.

Application filed December 6, 1926. Serial No. 152,782.

My invention relates to brake bands, which are generally used inconnection with a rotating drum to which a load is applied, for thepurpose of restraining or stopping the rol tation of the drum andthereby the movement of the load. The object of the invention is toprovide a tri-member band so acting as to have a snubbing action on thedrum, in combination with means whereby the release of the brake bandmay be quickened and the releasing movement of one member of the bandmay be directly communicated to an adjacent member. Other objectswillhereinafter appear. In the accompanying drawings- Fig. 1, is a viewpartly in vertical section and side elevation of a rotating drum towhich a load is applied, and a brake band embodying my invention.

Fig. 2, is an end elevation partly in vertical section of the deviceshown in Fig. 1.

Figs. 3 and 4 are detail views of portions of the brake band shown inFigs. 1 and 2.

Fig. 5 is an end elevation showing a modified form of brake band andembodying my invention.

Similar reference characters designate corresponding parts in all of thefigures.

1 designates a rotating brake drum, which may form a part of any type ofmechanism to which a load is attached or connected. For example it maybe comprised in a Windlass or any other type of hoisting and loweringmechanisms, or it may be comprised in a vehicle which is to be stoppedby means of a brake band. In the drawings the drum is shown as beingmounted on roller or other anti-friction hearings in standards 2, onlyone of which is shown, and as being rotated in the direction of thearrow w under the influence of a load. In this direction the rotation ofthe drum is controlled by the brake band. The opposite direction ofrotation of the drum is shown as being secured through the shaft 3 towhich the drum is secured. The end 4 of the shaft 3 is squared toreceive a crank. In this direction of rotation the shaft rotates free ofthe brake band.

My improved brake-band consists of a strap of metal which is woundaround the braking surface of the brake drum. One end of the strap isfixed, while the other end is moved under control to regulate thefrictional engagement of the convolutions of the strap with the brakingsurface of the drum.

The brake band, shown in Figs. 1 to 4 comprises a single strap 5 whichextends around the drum for nearly its entire circumference 1 and twoother straps 5b, 5 which also extend around the drum for nearly itsentire circuml0 ference'and outside of the single strap 5 as shown inFig 2. The adjacent ends of the single strap 5 and straps 5", 5 areconnected or coupled together by a suitable coupling or connection asshown in Fig. 3. Any desired form of coupling or connection may be used.As here shown it comprises aplate 6 riveted to the single strap 5 and aplate 6 riveted to the two straps 5*, 5. Both plates 6*, 6 have a flange6 through which a bolt 6 passes. The other end of the single strap 5'has riveted to it a plate 7 which is fastened to 'a cross piece 7comprised in the frame work, While the other ends of the straps 5*, 5have riveted to them a plate 7 b (Fig. 4) secured to'a crank arm 8 (seeFigs. 1 and 2) fixed upon a shaft 9, suitably journaled in boxes-10which are shown as being bolted to the cross-piece 7. One end of acontrolling lever 11 is also fixed to the shaft 9, the other end ofwhich is provided with a handle 11. A weightlQ is also pro vided on thelever 11 the function of which is to normally hold the brake band ontothe drum to prevent it from rotating. This pressure may be increasedbeyond that offered by I the weight by depressing the lever 11. Thebrake band is released from the drum so asto leave it free to rotate'byraising the lever 11.

If desired, in the form shown in Figs. 1 to 4 the releasing of thebrake'band may be quickened by any desired means which act upon thelifting of the lever to release the straps 5 5 and subsequently and inturn the single strap 5 Ashere shown these means compris'e'a rod 15connected at one end with the crank arm 8, and engaging the plate 6 withits other end. When lever 11 is raised crank arm 8 is swung to theleftfrom its position in Fig. 1,

the straps 5 5 are moved in releasing or slack position, the actuationbeginning at the outer ends thereof. Simultaneously therewith rod 15acts to release the intermediate portion of the brake band viz, at thatpoint where the inner ends of straps 5 5 join strap 5 and to furtherinsurequick and uniform releasing action the inner strap 5 carries clips5 overhanging the outer strapso 5 and compelling the latter to imparttheir releasing movements to the former., Also the outer straps carryclips 5 overhanging the inner strap so that releasing movements of thelatter are communicated to the former.

In order that the releasing movement of plate 7" will not bow the straps5 5 at the ends thereof but will distribute the slackness about thecircumference of the brake drum, I form the plate with projecting legs 5each secured to one of the said spaced straps, serving to reinforce andso stiffen them that the difliculty is obviated.

r In Fig. 5 the brake band is shown as being a single strap 20, woundabout the braking surface of the drum, one end 20 ofthe strap is'secured to the frame-work as is the single strap 5 in Fig. 1, and theother end 20" is se cured to a crank arm as are the two straps 5 5inFig.1, for the same purpose.

It will be observed that the form of brake band shown in Fig. l is,structurally, the 7 Having described my invention, what I claim anddesire to secure by Letters Patent is as follows In brake mechanism, abrake drum, a brake band on said drum and being of a length to wraparound the same a plurality of times, said band comprising two spacedstraps and coact and transmit the releasing movements of any one of thestraps to the other straps.

In testimony whereof I have signed my I name to this specification.

HARRY B. HILLS.

